CN204407868U - A kind of Intelligent capacitor - Google Patents

Abstract

The utility model discloses a kind of Intelligent capacitor, it comprises capacitor body (1), the temperature control circuit (2) be connected with capacitor body (1), the liquid crystal display (3) be connected with temperature control circuit (2) and switching drive circuit (4), described switching drive circuit (4) is connected with capacitor body (1) with liquid crystal display (3) respectively.The Intelligent capacitor that the utility model provides, reasonable in design, adopts advanced zero passage detection and many temperature sensors thermometric, can the temperature of accurate measurements capacitor, effectively controls capacitor excess temperature; Can at overvoltage of capacitor, cross harmonic wave, leakage current is excessive and ambient temperature is excessively high cause capacitor heat condition under, realize over-temperature protection, namely exceed design temperature and automatically excise Intelligent capacitor later, out of service, reach the object of proterctive equipment.

Description

a smart capacitor

technical field

The utility model relates to a capacitor, in particular to a capacitor used in low-voltage distribution network equipment, which has an advanced zero-crossing detection function, has multi-temperature sensor temperature measurement, can accurately monitor the temperature of the capacitor, and effectively prevents the capacitor from overheating. Smart capacitors for protection and control.

Background technique

Capacitors are widely used power devices in power equipment. In DC circuits, capacitors are equivalent to open circuits. A capacitor is a component that can store charges, and it is also one of the most commonly used electronic components. It can be divided into three categories according to its structure: fixed capacitors, variable capacitors, and trimmer capacitors. For the capacitor in the prior art, the switching operation of the capacitor is performed according to the communication command of the reactive power compensation controller through the internal thyristor load switch circuit. Moreover, hardware zero-crossing detection is used, and the zero-crossing detection is not accurate; the capacitor temperature detection is not accurate, and the over-temperature protection cannot be realized in the case of over-voltage, over-harmonic, excessive leakage current and high ambient temperature that cause the capacitor to heat up. Capacitors have a short service life, resulting in poor circuit stability.

Therefore, it is necessary to develop and design a structure with a reasonable design on the basis of the existing technology, which can effectively realize the over-temperature under the condition of over-voltage, over-harmonic, over-leakage current and over-high ambient temperature that cause the capacitor to heat up. Protection, that is, the intelligent capacitor is automatically cut off after the set temperature is exceeded, and the operation is stopped, so as to protect the equipment and improve the safety of the intelligent capacitor.

Utility model content

Purpose of the utility model: The technical problem to be solved by this utility model is to overcome the deficiencies of the prior art, and provide a reasonable structural design, which can be used in the case of overvoltage, overharmonic, excessive leakage current and high ambient temperature that cause the capacitor to heat up. Effectively realize over-temperature protection, that is, automatically cut off the smart capacitor after the set temperature is exceeded, and exit the operation, so as to protect the equipment and improve safety, and the smart capacitor has a wide range of applications.

Technical solution: the utility model adopts the following technical solutions in order to solve the above technical problems:

An intelligent capacitor comprises a capacitor body, a temperature control circuit connected to the capacitor body, a liquid crystal display connected to the temperature control circuit and a switching driving circuit, and the switching driving circuit is respectively connected to the liquid crystal display and the capacitor body.

As a preferred solution, in the smart capacitor mentioned above, a plurality of temperature sensors are installed inside the capacitor body.

As a preferred solution, in the smart capacitor mentioned above, a plurality of humidity sensors are installed inside the capacitor body.

As a preferred solution, in the smart capacitor mentioned above, the switching drive circuit uses an optocoupler to control the thyristor to perform overvoltage, undervoltage and zero-crossing detection.

As a preferred solution, in the smart capacitor mentioned above, the temperature control circuit includes an ADC sampling circuit and a signal conditioning circuit connected to the ADC sampling circuit.

In the smart capacitor described in the utility model, the temperature control circuit can measure and control the temperature of the capacitor in real time. The switching drive circuit: switching the capacitor through the thyristor. The LCD liquid crystal display: displays the switching status of the capacitor; and can simultaneously display parameters such as distribution network voltage, current, active power, reactive power, and power factor; and display environmental parameters such as temperature and humidity around the capacitor.

Compared with the prior art, the smart capacitor described in the utility model adopts the above technical scheme and has the following technical effects:

1. The intelligent capacitor provided by the utility model has a reasonable structural design, adopts advanced zero-crossing detection and multi-temperature sensor temperature measurement, can accurately monitor the temperature of the capacitor, and effectively control the overtemperature of the capacitor.

2. The intelligent capacitor provided by the utility model has a built-in temperature and humidity sensor, which can realize over-temperature protection when the capacitor is over-voltage, over-harmonic, excessive leakage current and high ambient temperature cause the capacitor to heat up, that is, the temperature exceeds the set temperature. In the future, the intelligent capacitor will be cut off automatically, and the operation will be stopped to achieve the purpose of protecting the equipment.

3. For the intelligent capacitor provided by the utility model, the liquid crystal screen in the liquid crystal display can display the type of protection action, such as phase loss, overcurrent, overtemperature, three-phase imbalance, harmonics, etc.; the intelligent capacitor has a self-diagnosis function. It can reflect the faults of electronic switches, capacitors, intelligent modules, network communication, etc. on the LCD screen, which is conducive to on-site fault finding. When the capacitor is damaged, it is easy to repair and maintain.

Description of drawings

Fig. 1 is a structural schematic diagram of the smart capacitor provided by the utility model.

Fig. 2 is a structural schematic diagram of the temperature control circuit in the smart capacitor provided by the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

As shown in Figure 1 and Figure 2, a smart capacitor includes a capacitor body (1), a temperature control circuit (2) connected to the capacitor body (1), and a liquid crystal display (3) connected to the temperature control circuit (2). ) and the switching drive circuit (4), the switching drive circuit (4) is connected to the liquid crystal display (3) and the capacitor body (1) respectively.

In the smart capacitor mentioned above, a temperature sensor is installed inside the capacitor body (1). A humidity sensor is installed inside the capacitor body (1).

The smart capacitor mentioned above, the switching driving circuit (4) The switching driving circuit (4) includes using an optocoupler to control a thyristor, and performs overvoltage, undervoltage and zero-crossing detection.

In the smart capacitor mentioned above, the temperature control circuit (2) includes an ADC sampling circuit and a signal conditioning circuit connected to the ADC sampling circuit. As shown in Figure 2, IC1 is an ADC sampling circuit that collects the analog output value of the front-end temperature sensor, and IC2 regulates the analog value of the temperature sensor.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments. Make various changes below.

Claims (5)

1. an Intelligent capacitor, it is characterized in that: it comprises capacitor body (1), the temperature control circuit (2) be connected with capacitor body (1), the liquid crystal display (3) be connected with temperature control circuit (2) and switching drive circuit (4), described switching drive circuit (4) is connected with capacitor body (1) with liquid crystal display (3) respectively.

2. Intelligent capacitor according to claim 1, is characterized in that: described capacitor body (1) inside is provided with temperature sensor.

3. Intelligent capacitor according to claim 1, is characterized in that: described capacitor body (1) inside is provided with humidity sensor.

4. the Intelligent capacitor according to any one of claim 1 ~ 3, is characterized in that: described switching drive circuit (4) utilizes optocoupler to control controllable silicon, carries out overvoltage, under-voltage and zero passage detection.

5. Intelligent capacitor according to claim 4, is characterized in that: the signal conditioning circuit that described temperature control circuit (2) comprises ADC sample circuit and is connected with ADC sample circuit.